JPS58177223A - Cutter for embeded pipe - Google Patents

Abstract

PURPOSE:To beautifully finish a cut face of a pipe which is embeded in a concrete and is cut by a pipe cutter, simply and fastly with high accuracy, by arranging such that the shear point of a blade is taken into and out of a small hole in the vicinity of the front end of a cylindrical body. CONSTITUTION:A cutter for embeded pipes comprises a body 11, a pipe clamping section 12 for clamping a raised part of an embeded pipe which is exposed from the ground, so that the body 11 is secured to the pipe, a shaft member 13 which is vertically slidable in the center part of the body 11, a drive mechanism 14 for the shaft member 13, a cylindrical body 15 which is inserted onto the shaft member 13 and is rotatable about the shaft member 13, a drive mechanism 16 for the cylindrical body 15, etc. By abutting the shear point 19 of a blade 18 which is projected from a small hole 20, against the inner wall surface of the pipe and then by rotating a handle 27, the rotation of the handle is transmitted to the cylindrical body 15 so that the cylindrical body 15 is rotated together with the blade 18, thereby the inner surface of the pipe is cut by the shear point 19. Thus, a cut face is beautifully finished, simply and fastly.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an instrument for cutting pipes embedded in concrete.

When constructing drainage equipment for toilets, bathrooms, washrooms, kitchens, etc., it is necessary to connect these drainage equipment or pipes to the pipes buried in the concrete notebook in advance. At this time, for the purpose of preventing water leakage,
The equipment or pipe is connected to the buried pipe at a distance of 30 m. For this reason, it is necessary to cut the pipe buried in concrete 2 to 3 cm below the concrete surface. In this case, conventionally, the pipe was cut using a handsaw, chisel, knife, etc., but this method required a lot of effort and time, the cutting position was inaccurate, and The finished surface was rough, and the pipes sometimes broke, resulting in water leaks later on.

In view of the above-mentioned circumstances, the present invention was made with the object of providing a tool that can easily, quickly, accurately, and beautifully finish a cut surface regardless of the level of skill of the operator.

Hereinafter, the configuration of the present invention will be explained based on the drawings.

FIG. 1 is a partially broken pressure surface view showing an example of a buried pipe cutter according to the present invention, and FIG. 2 is a partially broken AA sectional view of the distal end thereof viewed from the side. This buried pipe cutter consists of a main body 01), a pipe holding part (a) that holds the rising part of the buried pipe above ground and identifies the main body (11) as that pipe, and a central part of the main body 0]). The shaft body 03 and this drive mechanism 0 can be slid in the vertical direction.
It consists of a cylinder I41, a cylindrical body αυ which is fitted into the shaft a and is rotatable around the shaft 0, a driving mechanism αQ, and a cutting blade.

The cutting edge (to) is held in a holder αη provided near the tip of the shaft α [phase] and the cylindrical body θ→,
As the shaft body 03 descends and rises, it moves forward and backward in the horizontal direction, thereby allowing the cutting edge 00 to be inserted and removed from the small J (J) provided near the tip of the cylindrical body θ.

To cut a buried pipe with this cutter, follow the steps below.

First, as shown in Figure 5, after inserting the tip of the cylindrical body 0υ into the pipe (2) buried in concrete (1) to the specified position, turn the pipe fixing handle Qυ clockwise by hand. Rotate. At this time, the tightening is done by gradually narrowing the gap between the slits in the body (A) and the pipe (A).
2) The outer surface near the upper edge of the above-ground part and the tightening are on the body (A)
The main body αD is fixed to the pipe (2) by being pressed against the inner surface of the pipe (2). Next, in this state, rotate the head cap clockwise. As the head cap (c) rotates, the setscrew rotates in the same horizontal plane along the groove (c), thereby lowering the shaft body 0. At this time,
The hypotenuse surface υ of the cutting edge (C) is a taper near the tip of the shaft α.
The tapered surface 1 (c) and hypotenuse surface 01) slide, and the cutting blade moves forward in the horizontal direction, and its cutting edge protrudes from the surface (a). pipe(
It corresponds to the inner wall surface of 2). Next, by turning the rotary handle, the rotation is transmitted through the bevel gear to the cylindrical body 0Q.
is transmitted, and the cylindrical body 0υ rotates around the shaft body 03 together with the cutting blade (c) held near its tip. At this time, the inner wall surface of the pipe (2) is cut by the cutting edge a0 of the cutting blade (C). And gradually the head cap (ho)
By rotating, the f# primary cutting blade (to) is advanced and the rotating handle (5) is turned to cut deep inside the pipe (2), that is, toward the outside of the pipe (2), Cut the pipe (2).

When cutting is completed, rotate the head cap (■) counterclockwise to raise the shaft (13). At this time, the hypotenuse surface (A) of the cutting blade (to) is aligned with the tapered surface 2 near the tip of the shaft (α). ■
The tapered surface 2■ and the hypotenuse surface [
] and slips, and the cutting edge (G) retreats in the axial direction.

Then, pull up the cutter while holding onto the above-ground portion of the pipe (2). Note that - in the figure represents a handle, and (2) represents a frame.

Also, as shown in Figs. 4 to 6, instead of providing the tapered surface 2 (b) near the tip of the shaft α hoof, the cutting edge (
an annular coil spring that pulls the
It is also possible to provide a structure in which the cutting blade (T) is retreated in the axial direction by the contractile force of the annular coil spring () as the shaft body Q (east) rises.

Note that by lengthening the tip of the cylindrical body (G) inserted into the pipe (2), it is also possible to cut the pipe (2) at a deep location.

As mentioned above, when cutting a buried pub using the cutting MW according to the present invention, the work can be done easily, quickly and accurately, and the cut surface can be finished beautifully, thereby preventing water leakage accidents at a later date. There is no risk of it happening.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing an embodiment of a buried pipe cutter according to the present invention, FIG. FIG. 3 is a partially cutaway front view showing the buried pipe being cut by the cutter. Also, Figure 4 and Rust Figure 6 are as follows:
FIG. 5 is a partially broken pressure surface view showing the tip portion of another embodiment of the buried pipe cutter according to the present invention.
-B is a cross-sectional plan view.

Claims (1)

[Claims] 1. Pipe buried in Conch IJ-) (1)
2) Hold the above-ground rising part and attach the main body (B) to the pipe (
2) The pipe holding part @ to which K is fixed, the shaft (to) that is arranged at the center of the main body αη and slides in the vertical direction, this drive mechanism α →, and the shaft inserted into the shaft (to) A cylindrical body (to) that rotates around the body (to) and this drive mechanism αQ,
It is held within the holder α force provided near the tip of the shaft body (to) and the cylindrical body (to), and moves forward and backward in the horizontal direction as the shaft body (to) slides, thereby causing its K. The cutting edge is provided with a cutting edge (end) that is inserted and taken out from a small hole (4) provided near the tip of the cylindrical body (c), and the tip of the cylindrical body (c) is inserted into the pipe (2). A buried pipe cutter that is inserted into the pipe (2) and cuts from the inner wall surface of the pipe (2) using the cutting blade (to). 2. The scope of the patent claims that a tapered surface (B) is provided near the tip of the shaft body α in order to cause the cutting blade (end) to recede in the horizontal direction as the shaft body (2) slides upward. A cutter for buried pipes as described in item 1. 5. In order to retract the cutting blade (c) in the horizontal direction as the shaft (to) slides upward, an annular coil spring (to) that pulls the cutting blade 0→inward in the radial direction ) A buried pipe cutter according to claim 1.